Ok, just to calm down the fears, here is more specific info on what to look for.
1) The hacker will need a .swf file to run from NG in order for it to work.
2) The file will need to redirect you to a page on the hacker's site in order for it to send the info.
If any movie in the Portal redirects you to a new page, close the window, change your password, and don't open it again. If you notice something that looks especially suspicious, please notify wade@newgrounds.com.
This issue should be resolved soon.